Zetor 7045 fuel bleeding problems

[bmts_forestry]

Dear all,
I've trawled through the search feature on this forum but havn't found the answer to this so here goes...

I have recently aquired a zetor 7045 that's not starting due to being starved of fuel . I've fitted a new hand primer pump as the old one was suspect. I've successfully primed the two fuel filters and then the two bleed screws (10mm with screwdriver slot) on the fuel pump to either side of the four metal pipes going to the injectors.

So far, so good. I get fantastic, strong, air free fuel delivery to this point and there are no bubbles visable in the glass bowl.

Beyond this point i am miffed. I lossened the metal fixing on the 1st injector and no fuel arrived after 15mins of hand priming/pumping. I then lossened all four connections to the injectors at the fuel pump end and pumped - and got absolutely nothing. When everything is reattached, the only place where fuel comes through (intermitently) is the return pipe from no4 cylinder.

Is my fuel pump knackered? I notice the bolts stamped "oil" and the one with dipstick (nearest cab) is dry. Could this be an issue? How is this pump oiled, does it have it's own resevoir? If it's been low for a while will it screw the pump up so bad that no fuel can get through?

Thank you very much for your time reading this and I hope someone can help me.

I will try and post pictures.

https://www.imageupload.co.uk/image/DBBl

https://www.imageupload.co.uk/image/DBBr

The tractor did have starting problems at the farm it came from, but then i got it running approx 1 month ago. Then the lorry arrived to collect it last week and it wouldn't start, it got dragged around by a big new massey to bump start but that didn't work.

Thank you.
Ben

 

[bjarne_iversen]

Hi
First of, you are not able to push disel trouh the plungers vhit the liftpump. Vhen you open the trotle fulli and push the coldstart button you should hear a loud clik, if not the the rack from the govenor or the govenor itself could be stuck, take of front plate to investigate. You should drain both pump and govenor and fill them upp vhit engine oil to the max, there are level plug on the govenor and an overflow pipe on the pump.
Bjarne

 

[Renze]

The hand primer pump is not the actual lift pump. The lift pump has a big slotted plug which you can undo with a vise grip and a mower blade.

If your tractor doesnt even smoke (no fuel at all), most probably the governor is stuck. Fill the back end of the fuel pump entirely with diesel to dissolve the rust, you can gently try to free it with a screwdriver through the inspection hatch.

Even without a working lift pump, it should inject some fuel before it starves. "some fuel" injected, would mean there is some white smoke when trying to tow start it.

 

[bmts_forestry]

Thank you very much Bjarne & Renze for taking the time to reply to me and sorry for not saying this earlier, I didn't mean to be rude!

So I did as you guys said but unfortunately didn't get it going, so I had to park her up, borrow another tractor for the winch and get some work done.

As Bjarne said, the primer wasn't getting any fuel through & the cold start button had no positve click. I filled it to the brim with diesel, left it for a week, flushed it out and tried again - no joy.

Then i opened the cover plate on the side which exposes what look like valves & springs. I discovered that the middle two were not moving when turning the engine over. I sprayed WD40 and worked them with a lever and got them free.

Then i opened the top cover plate which reveals the upper part of what i think is the govenor linkage. I worked this with a lever and got it to move. Now i can move it to a postition where i get a positive click from the cold start button.

I then tried to start her again with aid of easystart but no joy.

I then opened up the metal pipes going to the injectors to see if fuel delivery had returned. Interestingly, i'm getting fuel to 3 injectors but not the 3rd cylinder from the front. There is a little white smoke when turning over but it won't fire. The 3rd valve & spring looks to move fine in turn.

Anyone have any ideas?
Is the governor linkage meant to move more freely?

It has since sat with fresh diesel for over a month now and i've occasionally gone and tried to start it but there is no change.

Thanks to eveyone reading this and thinking of my problem!

Ben

 

[Renze]

I usually throw the pump full of diesel and then turn her over. Pry the control rod into action so it starts injecting fuel , once it runs, be ready to push it back so it wont run overspeed and throw a rod at 6000rpm.

Youre on the right track with the fuel pump.

 

[bmts_forestry]

Thanks very much Renze.

I had a little more time the other weekend and opened up and removed the top fitting which screws/bolts down onto the pump body and from where the metal pipe attaches and goes to injector for no 3 cylinder.

Inside i found a little plastic "seal" (T-shaped with a screwdriver type slot in the top) and a little spring. The spring has broken up and the plastic seal looks a little worn.

Is it possible to get replacements of these little parts anywhere in the UK or posted from Europe? I have e-mailed some of the bigger tractor parts suppliers and all they say is that they can get the whole pump but not any parts.

Many thanks
Ben

 

[Renze]

Those are the nonreturn valves. Any dealer can order them because they are listed in the parts manual .

Anyways, your problem is in rubber hoses. You best replace all of them, also the one behind the fuel pump which is often overlooked.

 

[bmts_forestry]

Thanks once again Renze,
Can i ask why you think it is the rubber hoses? It appears that there are not that many, I will cetainly switch them out. Fuel is getting through to three of the four cylinders.

Thanks for all your help .
Ben